I'm sorry. I should have worded it in a way that I thought that this is what you did (it felt like it). Looking at your screens I see a little difference now. The eyebrows are higher letting her look a little gentler, but not blank imo. I think you're feeling that way because her iris is bigger, but the pupils are still the same size as M!Byleth's. Which is the case for most, if not all, female characters in 3H, although there are some male characters with bigger eyes, too, like Ashe or Linhardt and it's the same for them.
Anyway, I still think they are supposed to look rather neutral in the character selection screen and I wouldn't judge the depiction of a character based on that. I also hope they can be customized a little more even though that is likely not possible. Oh well …